Idea: Allow installation of package local dependencies

[pradyunsg (Pradyun Gedam)]

@notatallshaw

there would not be dependency hell

There still would be dependency hell, actually. See the following post for the details:

Allowing Multiple Versions of Same Python Package in PYTHONPATH

To explain a bit why this isn’t as desirable as it might seem: imagine I am using package A which imports NumPy 1.21, alongside package B which uses NumPy 1.16. I call A.load_data() which returns a NumPy array, then I pass it to B.process(arr). Either B thinks it hasn’t got a NumPy array at all (isinstance(arr, numpy.ndarray) is False), or it has an array that may have a different layout than its NumPy library expects (different attribute & method names at the Python level, different memory layo…